Answer:
The correct answer is letter "C": value-added reseller (VAR).
Explanation:
A Value-Added Reseller (VAR) is a business that depends on the production of other firms. They improve the performance of a product or add a special feature on it and sell that feature as a complete apart good. The disadvantage of this practice relies on not having control over the manufacturing costs since these entities do not know what exactly will be produced next.